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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1f2e9bbe45539d4633be27e335f2398878c9d87503ff0ba6d371372ddbf2e584' 
  AND token = '8kCOGO220Zz77gqh/8MwDUix2pklvdNy8jeZlN/Gt4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}