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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '687ffdbd4de687d22c550c839d00c4ff1feb7b6b3490b1589c703890c4af0087' 
  AND token = '1IqayA5K5+ol9vId12vqwwjemJ+8aXOBtI83+66Uy5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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