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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2c7daef2c5d9cecf005fda65c185edad2bfbdca43984dd370dcb419468f488b2' 
  AND token = 'jeeYGFeFc4YXMwrtgM982ha8+9vN4URbZfya4I5bYn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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