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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '318bebb7f98e6d20c0096e4862831f4ee33520ccb4cd707343346acc32bf6f8b' 
  AND token = 'yU1g7P4sa6m6++nDt87F1NY7hIP9G/rpynC6qXfX47g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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