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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '89c4116984c4cf1ef7f7a426ef2d12872457f7ab3df7789c7c677ee67d76d4b6' 
  AND token = 'XjfTP5zvWB/rO37EBdu7yHSkVsLnCyQbA6Xyk7epEEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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