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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '90d0c31b12d54a088bbd2ca26be73ece23718d199aa66e304a9b49dacb84e4ff' 
  AND token = 'MPYl86tenpxtlFKT9ZJ17Rb1hdjdE29OIFS32d8x6Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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