Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd01eea80b063b79a3dcee07910d5bb22d8b0675dcd9fb6c30f2f98d9d6c64e4' 
  AND token = 'JJLD17qnM8mVAztiJVqHHLuF0Bqh+aEONB+/s4umQaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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