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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fdf60a3420dc1fafb917d2b3e2e102cbd5f2db3c4f3b1d3c97e23eb355ba5d89' 
  AND token = 'EbUur73PU2PAHFjtdVh0mCgtC+JqEv5XYoUrF45QZ8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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