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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'df9731cd08988d48f5a01aa1729c2b151638ab307c6cfe12b7c7dd9c7d5b805c' 
  AND token = 'umIgbYWRCT+gqOJL2UqTDZ4Cf4leL0x5Vq1NNO+Q9k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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