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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7848645cedba3264999cc31c2aaec6438169f7a07bd172ad34460bf096c10e87' 
  AND token = 'asUYTEGW9YmvQlGSQaqR3gpCysJ6Uep4tSK5YrlJC7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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