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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1c60815d3e102cc3e09bb09e2935c73c8edba84d14185bc7cb7330e3d6019aba' 
  AND token = 'sOxZlv9li6aWcm410gGj6ai5krjDt6123Qs3rIQ4iug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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