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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '5e3a4a213bce60f541ec0386e2eb99ab06676b83ae001f75afeec0aa7ea9ee63' 
  AND token = 'JontA5j1JEJvj5zLda8m21MvZqZ7etOD2QYYkz3g5XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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