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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a33a3f9de9101ff6f3072ce6591894823e7f1b9551dcfd85d2d3c0e6b1e9f536' 
  AND token = '2oNvl6LcmDVFObygxvlntJW9faDI9l0verQWJLKDrXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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