Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c5e0b6909f34a341fd684dd32898d39f4fcf89758e9332be4cad897c3a2e60' 
  AND token = 'rJ/vFYtzofa4CvCegfJhhQNJmIteMO3SFI2iYPcUgQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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