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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a5756e6195aa1bfd56da99f0763710a8074fcdee3cdf9098a5018a5b845a4fe9' 
  AND token = 'jNNc2Xb5Xr683QUB+llKwxIz9M/vGeusHneLcqRlyyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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