Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee9a0542badc008e329593b338f248c397b90c3ec91025964016df7d909f7cd' 
  AND token = 'vPebQuw+/HzgHoYPA4tNejq5l4DCXx6kuwJLxaEaoWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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