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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4845252df89a9eda94a77c4cb3cc8688bc268483ecd6fa95ca50b14edf247471' 
  AND token = 'cra1vhycxNCVcmO/wjoOwtE98octSeJJbQ4rLmbmMuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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