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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cc89c992a94e5e29c73ab5cacf3762726ed78c4837ac4352365e5ab8c2fb62be' 
  AND token = 'YKd0kNsOiyHsma24VdTOkSDK+amlibFD5Bgpi316014=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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