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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '92e9b2a83b57e38cb90eca3468fad90ad0d8cdd2f3424dca6ae860a07c9e4805' 
  AND token = 'INnFkaLcDeaE0XQJEyAIT2aIPdJZsLRIikSmqa/P8OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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