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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'bd844502e403b986407e970b82beaec496500a6eaea7189623b07572dbc441eb' 
  AND token = '6F0TyjOSiICkGrJSnvptbe7LCrWlJ0dyGgLpBagHggs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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