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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '370dfa78c6a49a6867255720420024a0f3f2ad1c38b02c4757bb94b1efc863cf' 
  AND token = 'uiD4BqBA5by7JJFltuESCcgJe9m8Qz1GpgJA86UkdBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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