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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a8dfa1af2983c8fd0ee03cfd72459c3453c0993a8f332adf08c443a8384afb80' 
  AND token = 'c07nw/UQZ1Uo9H1EQ+7TQTr53n2/vuPUAIJoXhqK+5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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