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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5772f88d00c08cabc08bf4fcfa694d7743321c29b3112613ae99798f7211461f' 
  AND token = 'YpDUDAMKJtpRItuctb1BPTeToJXJw9Mu5AJBbqwWK+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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