SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd81fffdcf323a67d1ce69bd8ec103f91b9478f937b169d8a258462f000b9c3e6' 
  AND token = 'sWTJWuQihk72S4zGs5nIKXCOjMywmG0Fs8nVMrNnXQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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