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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'bc56eccdcc4ef666e49d826afdadc4aa27a42e9bdc45144968fe1fd2112e5191' 
  AND token = 'ftrA7x321Xt2dRi1boV/CCFn5jPzsnPUkYlHDEAbcHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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