Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0f2596472476c3a4af040b9bc8b15c072fdc6876a386483d4ee18e31a74c5b' 
  AND token = 'fP7vk4Q3UM58jDooXWUyCUIOjIM3Yljfjq6x49b1oXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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