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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1068b332284133ca424f5e0d2fb643be8c067a4a6cfa8f0b14bf3c0f03c29616' 
  AND token = 'NexLLWsVL6bydjGPPtmFCgNn2M67+yD3+qldJPVzxfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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