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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '833c868c5f168b0c21da284369af90615fcb14bf4bd8a97a92f2db6a469b9e11' 
  AND token = '0TfZikGUEpn3qkdjhvao8DAmKfkIq48pJQWNX8byOoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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