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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '761813fe55456a47d1f72d2be267c9b47871a7aa7e21de6d96b2793f0d4ecf8c' 
  AND token = 'toqn4uRgBfaCSWSLEJjdrk6F0gK5cLJpp6SM36Sw4DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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