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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7d7eaad0c0bc6b61f7a3dd740f1cfbdce6934e06ddf157801ff9c679f3fee9d2' 
  AND token = 'dRcul6cEw+DKU+LmXgxq3aBteVpPCrqZIu/NQkiJom0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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