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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '912a190d241d2d0f5668c33dfa336209a2225f1efa9c4bdd24c5fac607a2b39b' 
  AND token = 'KfLD0PAwkMZTSgpBXUVcyej1XxI6Xc1NOfLxy1PhcEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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