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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e8d812836dd03bb6894a43fd286881b0450a7e4b2b25faf1bebea8c54e39c2ef' 
  AND token = 'wL2gm69mNfY9VZFp+H9pJHg4rmboCKeoaljREs12H4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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