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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8a8fef348516b0481019ab3272cede7cd1ba773db68a2d9b54d0f4dd0e55cbf6' 
  AND token = '2VzHjA6Qm29CgT1YMWDbKssuu57Fcn8pasebrBDeOb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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