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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f373733edb413cede36b57bde135b213ac4d369a621ff700cacf20610a877ff2' 
  AND token = 'TdBBJvJlJTVVy+Uiu84nva5X+7k73nSXBXqxJ2461tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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