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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '210ee48a8fc0049f76166bbb04dd017c182ea91812461af36763a51b47dc0c5e' 
  AND token = 'kblcg62lxbRFvg04gJLilxEUBjj+Ha3yBPYTaHkBdEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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