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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd28e71a5f395f37f53d3688701412559d867cf11907ff8b3edba2702f6338da9' 
  AND token = 'PB+f9SzKoqMr/eJOmuISpj18COnmoOoZae6I29tHc3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00103

JSON explain

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