Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9457ca2fc2c25b849f8b01b980fb146d00272aab5dc1d0e0746e5227e803155' 
  AND token = 'SRwy3DyGVhJjPhaMMY7KpAH1Fy1GeGcU5WrXFNZ5aoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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