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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee2d80aba9e6b4e9e95520d15a498ce7543ba473068e76e0533802bf717f1582' 
  AND token = 'jfeIQIrGe95TjwZ0SaITcpOCulRIf+mCM69/QST74Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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