Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c4c0dc4b6b273e25f9101c8f0fcdc6b9556f756a2dd4589b6255eeaf492dbe' 
  AND token = 'Ht8aW5ElJ0fJAuoKF/FAW80FDjWFJKmP2nBrPG6XNBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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