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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4216bf8e2f12e03c47b05eb77cd955e4a9e68aae4a7c5cced19a811fcfaa5f45' 
  AND token = 'S5yNf+/11tHF3dUh/Gfpah67JFSdD4f1zxDdluu89fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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