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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7b390b026fc4d41e644a7b28677da3453e4ede6671b1680ee54ea2c242ad14fd' 
  AND token = 'VLGU1vukHlCTm9gNpBLnzDBJxV8v3i0/n2YfGt26bJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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