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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '3447469d92cb0230686910e8bec12e517317b9ba795a6e1b686039ec089d08d7' 
  AND token = 'Bo88ACGjUrWk+6sW/BoKbEc5gAFlkGkYIsPhR93E2+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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