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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'eb174d8fd4b1021caadfc36a4060f0f65c769078aa34125f5037e362fd52e854' 
  AND token = 'y8UaO2JET+hmAT52hNzj3ky+iW+kWDH50ZFqnlf3P14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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