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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7173bee6eeda5bc7dcb09b8b3081a56c58102c1dd53e5cf56e729abfc1ad1876' 
  AND token = 'V32ezmuSeoaxGc1o/wr1H7mqVT6fH2TquJZJpKUMBps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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