Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3468a16a60a3065ea001c7e4f342abb2d39abddb202de916fbdde31d1a85067b' 
  AND token = 'YV0CUstperms0cIOejbe4M23mkh4CIZbWi+JE2y9/Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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