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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '10b7f6f778327a32d1ddfff5e56c3bf0d3c57b14a84d7b21ae0ab3744f7a2516' 
  AND token = '6mTrWQTysotebzR1QAqJrwXASGCbCcvCE1E42R1sosQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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