Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4386ca77c10d91e9e42f9f54b79f4b9dd0d5f7f42a8847fe1e0ea8bde739f54b' 
  AND token = 'taWrvCQ9jeJA5PJM4JaVGFIDIThx8Zi0aatK5Ucd17o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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