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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '67db95edf0037e699767d6eb8ade375a4b9db1a7dab692472e5dd5eab714f69e' 
  AND token = 'UH3UUiCKnUaWn94k49jutO7kqTYZEEUX4OlfLCnRKcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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