Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa29e50222d4646d3dc88bb7611f02b9c3a8a99e6d3be26887c191d1e2ddd9f' 
  AND token = 'DCg63/HKaEzOaO9LKmteBf4YaT3hhUIHbi3Q7p7PXaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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