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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e5d6be6b09a8c7be5960ea82cde8e053c2b5e4c9ed127a3670b826f9806acff0' 
  AND token = '8lPLdGVphAD5nwQMZi2tAC0HQVaiWJEoxW+CE8lH0HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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