Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f50837dfb2a64a1d21dcd88406578e989232fc3bc66c9ce49f30479c108c1e' 
  AND token = 'O7PlKPeiS88P8KrPNUzxhv2rUyun1ABfXFnELYhTuIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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