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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a01b57e82441216afa1f6cfba1291cc7cb86de181393c1736bbc8b57b122d36e' 
  AND token = 'Eam7GTz0cVewbeL17DKQE2z8T/4ZL4Esf2uDKkxRWVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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