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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '059c859ec216bc0d1c4c76d04bd99929ba491eaf936c7289a6c3014ecdbf4d2e' 
  AND token = 'nu2xy+aRky78tb3OAQRHwF3POI/nopehs8oN8iGbf3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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