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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c87a9f1c913ab6feaa7d38e17c30c9caf06cce8af9a157bfb4edf12e7df96687' 
  AND token = 'EuAGeFRjUnG9g0vJ1kkNq4mVw6Kcj4rwEEd+u/eZbuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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