Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4971138e7471b4f4fb762e7a599427fe715fd9afd1fdd602a34be61ab7c09d' 
  AND token = 'dFOc/TQLeBfSTHnVi3x4BVHdKNWTmW26XTPwWziILXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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