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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6eed672f482684a3406e22d3b9c6c3bab6e2b059859e0539561b4a2a5119be30' 
  AND token = 'FyNZiRF3AiMShBfiO62CAWErt853VpMlJJaeSJ4jD8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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