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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '64f22181a9c2f79a439e6432a27aedd99bf2e5b6e99171bfad3100344f544eb1' 
  AND token = 'csoQtUgTzxX3UxNGkCoHAVGrvAcvtqsP7RyvtekObvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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