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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2c42b51a3f5a67be83d2d1454ab613828cfcd27dda4bdd341a7daef2f041e834' 
  AND token = 'Jh0/3FX7lCpU6syyjPG5h1UQiR1xAZuoJe8Kes9mnAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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