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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '0cb17f1525b625179338e4e284cd79914f67083aa058c140f551c8797c1734a5' 
  AND token = 'F92yWP+9w30dZq6vxR+cbWgKm7P1OqU4MQvrW289r6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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