Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b32428ed27ae5347c6a3a8f9015faa147b0f30f138b40668db6fe36c33f68fe' 
  AND token = '8CjFfozPONEem1D8kNF7+6QXZZHitEcAYZG0GKsfYoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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