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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '46ba5be114a247c6498faefc607ab85dd2596e892baf05599b4a7d46d8d3e789' 
  AND token = 'znigB3IQxgTk3fuacy4yeQgOKE6amdJzN06roBc4gG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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