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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1c33af93386f96131b7615726ac573f91ce5f6a4262a6473671c0166535f417a' 
  AND token = 'FblzZ7uIjA0kftSiEG75Xwu9XR5K392ZPb4RSnC11ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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