Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b8b3bb0fa24c91ac7b2469d154af75cc43bf18f3e9d919415460b151094af1' 
  AND token = 'nn5/cET8CJJJ8z/0lp7iLs0kGfB5BsGGxEQ+4qKXFAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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