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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '208d78c965907175d720f571c1276602130fded9fe9d59eb8c578c6564076bda' 
  AND token = 'cXh7oDuhI2uz79dMSNLRBirQFYCK3R8p4Nri++44B5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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