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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '6d4926390ab90041cf3e66b85f1b3f6a8b1276d2c1ac48c30919af241e71522f' 
  AND token = 'vKJWY2oT40oOWOyjvOOm54oyXgBsxiVR5Ks0YWLpvu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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