Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2ceb32470093e288e4ce30b0b865af571a607e1c4ab0c2bb1c0f65dde9f448' 
  AND token = 'wEpoKc3gAGwGkqmmTMWqQp7n3pAv4LPToxYIiC/9Y0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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