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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '895f993d5e744d316a4eb3f2165d75b8e2f4a126966cdb9e6ef92ea8bfa4aa73' 
  AND token = 'vWpcU+KfcX69NrgmJfLlM58eVxyZZx9ZVLU07XmVFCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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