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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2798145762051f900b72435713bed2ef1a09f7f2698bd908af3af87d4921d37d' 
  AND token = 'YvpvyAERTbT1FCIyw3f1mjYeLN2p9Blf5PWHEoQAoow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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