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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6f95eb7f4ff54e28f4628d9f6483343f56948485ba7a94e025f36b6410d70276' 
  AND token = 'hxDZpQ36ZYKrObyBZdouQls0jQp66d/skaUoWyz6zik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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