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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '68126219f38dc2fabb2fd904fdf0ff2ff9471faf0cc78abec30a9e28db1440e4' 
  AND token = 'HvrRTz8KC9fFaXrNE7RVeEvHRSTz2rM57aq5CwF93Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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