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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '0b0f387499e9af8c640f0eeb0fc6ae036b15eb16e8bc5991e5b9602372374aa4' 
  AND token = 'gjOlIFcoxM0IbxTK4roV26IXKzyn2vRf8SuS5dwWQ78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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