Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f086e240709a3d0ed0c6077cc982390959b8aaa5512fa2fd8d8a617edade670b' 
  AND token = 'RGx0ntpzasF6NU3Awv5qvFXu67PsWppKqk9VMvRctRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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