Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f8856d96cf1fa6942139e23e9bda5262bea376923859bdc88485695016be56' 
  AND token = '0gk8KAZytldzWDtOC15NdpEzNZ2feOf1ur4hjriBCVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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