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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9db8675bf7176746dabc1abe3d8d830b75600c51368c5daaba323d2ac1e0965e' 
  AND token = 'UNzo6F7cOEF0O/wnXAD3QkRLnQzfYEXXHUGaICwGAMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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