Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1fccdd2a02625075eb106fbe0e87f84eb8003e3d95a8eea4b0e50a427eb21c' 
  AND token = '1X9Qy056GdnMkbc04GPy+xQApOPHTtd/Aovdp9t9wPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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