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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2c74efc603fa6577ac9f09deed357941a0cf350f03dc8331208fb088c56f2408' 
  AND token = 'naKQj1ELsqIo0U5KjKb5gjtHaM77CfGOwsFXR+lHKwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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