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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4896ef78741e575dd9e3200101e9fdd22ccca97fa05c93d21e07185a045de380' 
  AND token = 'U3p0G/EKbAClF5lkcMwW+RPoTeVjZCvcXX0Nzsov3pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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