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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f292398654e295481fc36049dd930fa3a83d2a7a78c9c50824d59604eb6c6795' 
  AND token = '2sY9q9CCJw8u1rQSnnomcfaWmNhzeeQ8hddoS0eDJa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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