Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd426eae6bf5f5cf04176c30605108e49217a663b4ddc287003bace5fea10dccc' 
  AND token = 'DVYMC24V3EndjqO1DHzecQEoaDRNdVPO7kCrnplOgoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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