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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '09a524855937b97095f11e84d2b038f55054974f979d0050bb386e08da0db2fc' 
  AND token = 'OkctPKRGka8kC+y6FOQn9GPakKdp5ucJBVU1we6Y244=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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