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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3e918dec7c9a4082a9df496293e8a376d2a4050f371456bfd164ba7c6886e2e9' 
  AND token = '7P7J5LIO4hobVLg9noJuUgEIRb5DxKbgEP9mnlWBN1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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