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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2dc48c4a5831e5eee518bdbd823e679e017267218ae93bc4a1ea2bb99ddba290' 
  AND token = 'FbKOgc0elh7uZxrjyY2xfkIH79hcGAE8oJGjTMU2unc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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