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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a2bcf298677bd26d0596bc95d1d89a0f7b55d69942e576b024464ee208abbeb2' 
  AND token = 'yRx/LfD329txIErs5/aRVqvYmx/eC/ygIX8aMBlUUY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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