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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '49d5acbcc4a3e0a842d2fba8ab9e7f3a7c1a0d1aa86c67bd81c1e3323cf9ef08' 
  AND token = 'oBoqK/6mRwcvoHNZJlW8ucQSEARHkH5o6bP2CefQEVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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